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the solution:
2
4
1
6
5
8
7
3
9
8
3
6
7
4
9
2
5
1
5
7
9
1
3
2
6
4
8
9
6
3
8
1
7
5
2
4
4
2
7
3
9
5
1
8
6
1
8
5
4
2
6
9
7
3
3
5
8
9
7
1
4
6
2
6
9
2
5
8
4
3
1
7
7
1
4
2
6
3
8
9
5